Abstract
During the concrete pouring process of a dam construction, timely and accurate temperature monitoring is of great significance to reveal the thermal distribution characteristics and evolution process, and control concrete cracking. In this study, a positioning method of temperature sensors (PMTS) in a concrete dam is developed to determine the arrangement of temperature sensors quantitatively. The proposed positioning method is related to the restructured thermal field based on the natural neighbor interpolation algorithm, and the cross-validation. Based on the method, thermometers, distributed optical fibers and infrared thermal imagers are optimally installed in a super-high arch dam for real-time measurement of concrete temperature. The results show that the PMTS is reasonable and reliable for obtaining the dam global thermal field. The on-site temperature monitoring data indicate that the time and space temperature distribution law of the restructured thermal field is consistent with the actual situation of the super-high arch dam. In addition, the cons and pros, and improvement of the PMTS are further discussed. The proposed PMTS is a valuable method to monitor the global thermal field of concrete dams.
Highlights
Concrete dams usually have a large pouring size during construction
Compared with the method of determining the position of temperature sensors empirically, the positioning method of temperature sensors (PMTS) proposed in this study, which can obtain the thermal field of concrete dams more efficiently and provide method support for the arrangement of temperature sensors, is more reasonable and reliable
A positioning method of temperature sensors is developed to determine the arrangement of temperature sensors in concrete dams scientifically and quantitatively
Summary
Concrete dams usually have a large pouring size during construction. A remarkable thermal stress could be generated (Lin et al 2014). Since mass concrete usually contains few steel bars, the thermal stress is almost entirely borne by the concrete. If a larger tensile stress is generated due to the temperature change, a greater impact on the crack resistance of the concrete would be inevitable (Jaafar et al 2007; Lin et al 2015; Schackow et al 2016; Lin et al 2018; Lin et al 2019). In order to effectively control the temperature change process of mass concrete and reduce the risk of concrete cracking, timely and accurate temperature monitoring is of great significance during a concrete dam construction
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